Attachment-plug.



. R. B. BENJAMIN.

nuonumn nuo.

mmlonum man mmm. no1.

1,012,970, Pateuwd Dec.26, 1911 M16/65,52% dwzfrf/f/ar:

, www lay/m @MW HZ@ Rf B. BENJAMN.

ATTACHMENT PLUG.

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1,012,970. Patented Dec. 26, i911.

2 BIIEIITS "SHEET I myn i' t 1,012,010. y

. To :ill r/mm il muy concern.

' lie it known that l. llntunm il. llt-Irs.- j nts. a citizen of the United States, resutmg i v ttt Chicago. in tlte euttnty of Cook and State l ot' illinois. have invented new uml useful improvements in Attachmentllugs. ot' which the following is a full, clear, eouese, and exact description, reference being had to the awonuntnying drawing, forming J a part ol' this sptafilication. t My invention relates to improvements in attachment plugs.

'tine ol.' the oh'eets ot' my invention is to provide ay nove and exceedingly simple lorm of lug which eanreadily be inserted in a soo-el without. twisting tlte connecting wires.

Anotherobjwt of my invention is to provide an attaelnnent plug. so eonstrueted that ready access may be lmd to the bindf the electric conductors without. trouble.

Further objects of my invention will appear more fully hereimil'ter.

I tor the purpose ol dist-losing my inrete tion, l have illus'trattal in the neeoni|atn\'- ing drawings certain l'orms whieh iuy invention may take.

ln said drawings: Figure 1 is an elevalt) tion nl' tmo form ol' my invention; Fig. t: is a sectional view thereof taken ou the llim.l 2-2 of Fig. l: Fig. 3l i:' n .sectional rie taken on the line tl -tt ot' Fig. t: Fig. I is a plan view ot the plug ilhettated in Fig. t:

85 "'g. a'i is au elevation ut' the itaulating base with the threaded sleeve removed; Fig. t' is u sectional view ot' another I't rm ol' my iurention; Fig. i' is a plan view ol tbestrueture illustrated in l' ig. Ii: Fig. et is a see- 40 tional iiew ol' still another t'oeni ot' my in veution; Fig. tt is u sectional vien tnlten on the line :t1-ti ol Fig. H: Fig. ttl is a seetional view ol' n inodilied torm ol' the iusubiting bushing; uml Fig. ll is n sectional view ol' the sume strueture taken at' right angles to the seet ion ot' Fig. l0.

Itelerriug tirst to the .structure illust rated in Fig. I to i. iii this lortu ol' my device, l

provide u body portion or base I which is 1 60 preferably formed ot poreelniu or like iusulating material. \\'ith the device in the position illustrated in the drawings, thetop .0r upper end ol' the base 'l has secured Y thereto, in a depression or recess 2. a plate 55 3 ea rying a binding pest t. 'lhis binding ATTACHMENT-PLUG.

lpeetlentton of Lettera Patent.

Applteltton lied June I4. i801. Serial No. 380.520.

ing posts to permit. eonnwting the ping to UNITED STATES PATENT GFFIC E.

REUBEN B. BENJAHIN. Ol CHICAGO. ILLINOIS. ASSIGNOR 'I'O BENJAMIN ELECTRIC XANUFAOTUEING COIPANY, OI" CHICAGO. ILLINOIS. A CORPORATION OI" ILLINOIS.

lutentcd Dec. 56, itil t.

post. in addition to forming a member to which is connected one of the conducting wires. also preferably foetus au exposed center eontaet lor Ille plug alnl is atln ited, when the plug is inserted in the amp 59 socket, to engage the center contact ot' the socket. 'l'he conductor 4' extends through a longitudinal opening t formed in the base amt having a reduced portion or passage i, which in the etnlunliment. of thel inventton illustrated is located between the axis of the binding mst and the periphery of the hase, aml the iatred end ol' the conductor is looped over and seeurml beneath the bind ing screw 'l. A hollow rivet 8 lits in the reduced portion 'i' of the opening ti and is llanged over a shoulder on its lunler side and over the plate 3 on its upper side to seettre said plate in position. The opposite tertnitiul of the plug which is adapted to engage the threaded shell of the socket, comprises a threaded tnetal conducting sleeve l0 constituting the outer contact which rotatably lits upon the exterior of the hase und. in the particular embodiment ot the invention illustrated.immediately incluses the said base, utnl lum formed ut its bottom a |nripheral recess ll. in which tits au insulating ring or lmml-bole l2. The ring t2 is provided with au upwardly extending nntullar shoulder or hund I3 which is adapted to engage the sleeve ttt to aid in holding tlnsleeve in position. 'l`he hand lli it located beyond the threaded portion ol' the sleeve t0. and. as shown iu Figs. tt and H, is preferably ol' substantially the same diameter as the threaded portion ol' the said sleete, .so that it Italy enter the socket designed to receive the plug. thereby preventing` exposure ot any portion ol' the sleeve l0 at the outer etul nl tlte socket. 'lbe outer eontaet I0 itself is self-supporting iu that it consists merely of a metallic threaded sleeve having a taunt-hold alul la not itsell diriaetl'curried or supported by any body portion of insnlatinr materia.

-lly reason of this l'aet uml the urtlter fact that all the conducting pa'rts except the sleeve may, iu the preferred forni, be attached to a unitary base and the eondtusting cords earried to and eonneetml directly to sueli base, the device may be reduced to n very simple nml compa' form. interposed between thel sleeve l() and the base 1, and surruumling the base, is a metallic conduct,-

ing sleeve or ring t-t haying a reduced end portion 15 threaded to form a threaded socket which extends through the opening in the insulating ring .2. 'l`lie upper edges of the sleeve 1l are inturned over shoulders 16 formed on the insulating base l to nc vent displacement of the said sleeve. l'hc sleeve 10 is adapted to make slitting engagement with the sleeve 14, which constitutes a sliding contact member whereby thc same are always in electrical contact with one another. The sleeve 14 is provided with a plate 17 riveted thereto and adapted to tit within a channeled portion 1S ot' the base. '.lhis plate carries a binding post 1t) tt which the electrical conductor i2() is secured. The threaded sleeve 10 is maintained rotatably in electrical connection with the contact member ll by means of the base ot body portion 1 and a second body portion 2t which are suitably fastened together. ln thc form shown the body portion E21 consists of an externally threaded bushing of insulating material which is screwed into the threaded socket 15, thereby fastening the two liodv portions 1 and 2l together, and is provided with an amnilar tlange constituting a cap or a hand-hold .22 which is eo-axial with the sleeve and engages the under side of the insulating ring t2, which )reventa removal of the sleeve. from the ase. By this arrangement the two body ortions coperate to maintain the sleeve 10 in electrical connection with the contact member 14, while at the same. time the said sleeve may be readily rotated about the base or body portion 1. When the bushing is inserted in position, a portion 23 of the base 1 extends into the center opening ot' the bushing, tliron h which the conductors pass, and wedges t te conductors against the wall of the bushing to prevent the conductors from heilig pulled loose from thehinding ptmta.

liv removing the sleeve 10, access may readily be had to the binding post 19 to connect one of the conductors thereto. Due to the fact that the sleeve 1t) is rotatably niotinted iipon the base, it may be readily screwed into a socket without turning the base, permitting the plug to be inserted in position without twisting the conducting wires, and the ring 12 ferais a convenient insulating member by which the sleeve may be rotated.

As shown in the drawings, the sleeve 10 is telescopically disposed with respect to the base and when the bushin 21 is removed the said sleeve. may be readily slipped otl' or on the base. lt will also lie-appartmtthat the sleeve t0 matl be removed from the base without disturbing the .connection ot' the end contact: with the hase, the removal of the sleeve 10 from tio bm being entirely independent of the end contact.

When the dei ice is in assembled relation, as shown in liig. 2. the binding post It, being ut the side of the base l, is concealed by the sleeve l0, hat may be cx nosed t'or the pur iosc oll connecting the cont uctor associatctl with the sleeve or for other purposes b v dctaching thc bushing 2t from the base alnl then slipping the sleeve otl` the base. .ln the preferred form all of the electrical conducting parts except the sleeve are earried by a unitary base. ln the present embodiment ot' the invention there is a. single piece or block ol insulating material constituting thc base; the bushing :2l and the sleeve. I() may be removed without disconnet-ting or disturbin r any ot the conducting parts or termina s. l

'l`o insert the plug in u socket, the sleeve It) is intrtnluced into the open end ot' thc socket and then while the base is held sta tionary by grasping the lnind-hold 22 with one hand the sleeve may be screwed into the. socket by turning or rotating the lmndhold 12 thereon willi the other hand. A rotation of the threaded sleeve 10 in the opposite direction ttnscrews the sleeve 10 from engagement with the socket. Thus the sleeve 1t) may be rotated independently ot' thc base in either direction to connect the plug with or disconnect it from the socket, thereby avoiding twisting of the cords leading from the attachment plug to the translating device.

In Figs. (i and 7 l. have illustratedanother formel my invention. ln this form, the base 1, the center contact and binding post it, the sleeve 1t), the insulating ring It! aiul the bushing -or body portion 2l arc constructed and arranged in the same manner as are the like parts illustrated in Figs. 1 to Instead, however, of providing a sleeve 14, I provide the contact member in the form of a metallic ring 24 which is adapted to make a slitting contact with the sleeve t0 at. the point where .the peripheral recess 11 is formed. 'lhe ring Qt luis struck up therefrom a lip Q5 which carries a binding post .26 for the sleeve l0. A threaded socket .Z't' similar to the socket 1:'i is secured to the ring 2t by providing at its upper end a peripheral recess 2b in which the ring Q4 is titled. interposed between the sliottlder formed by the peripheral recess 2S and the end of the insu ating bustling or body 21 is a compressible rubber 'ing .tl which, when the latshing is screwed tlight, clamps the condoctors nml prevents thc same l'rom being pulled loose from the bindin i posts. 'lhe rubber ring in connection with the conductors also prevents the base l from being withdrawn lrom the sleeve lt). As thc wires are connected to the binding'posts on the base und are chimpctl by the ring 2t) iu the socket .27 the base canitot be separated from the socket. and permit the displacement ef the sleeve l0. In this l-truclure it is nca-essary to separate the ring f2-t from the sleeve 10 in order that access may be obtained to the binding post t with a siiitahle instrunient.

In the structure illustrated in Figs. 8 and t'l I have provided thc lip 2f with an alignlar extension which so positions the bind ing post 2d that the saine may bc reached with a suitable instrument. from the top of the sleeve. In order thatv the lo.. ning of the bashing 91 will not displace the sleeve 10, instead of providing the saine with an annular llange to maintain the ring l2 in position l provide an insulating ring 32 which lscrews upon the exterior of the threaded socket 27.

In Figs. 10 and 11 I have shown a moditied form of the bushing 21, adapted for use with armored conductors. In this forni I have shown the bushing as provided with an extension 33 having screws 34 passing therethrough and into a metallic lining tif, which screws are adapted to engage the armor of the conductors to prevent the latter from pulling loose from the binding posts of the plug. This form of bushing is particularly adapted for use in connection with conductors which extend through a single conduit as for instance what is known in the art as the Greenfield cord. When the screws are screwed home upon the cord they securel hold the same in position.

W lii e I have described several modifications of my invention, it will be' understood that the characteristic ,features of the invention may be ciubodied in other forms, and I do not limit myself to the structures which I have illustrated for the purpose of explainin f thc invention, except as set forth in t ie appended claims.

Ilavii thus described my invention, what I claim as new and desire to secure by Lctters Patent is:

l. An attachment plug com rising a base having an end contact, a com acting sleeve telescoping the base and immediately inclosing the same and removable imlepciidciitly of the end contact., and a binding-post on the base for the sleeve conductor normally concealed by the sleeve but exposed when the latter is rciuoved.

2. An attachment plug comprising a base having nn exposed end contact and a side recess, a threaded conduct ing sleeve telescoping the base and immediately inclosing the sinne and removable independently of the end contact, and a binding-post for the sleeve conductor located in the recess and' concealed by the sleeve lait disclosed when thc sleeve is removed.

2*. An at tachmcnt plug comprising a base having an exposed end contact and a recess in its side, an outer contact consisting of a removable sleeve immediately surrounding and inclus-ing thc base. said sleeve being rotatable independently of the base to connect the plug in aisition for use, and a binding-post for tie slceic conductor located in the recess and concealed by the sleeve but being disclosed when the said sleeve is removed.

-l. An attachment plug comprising a base having a contact at one end and a conducting member, a binding screw at the side of the base for connecting one of the condom tors to the said member, a conducting sleeve surroinidiiig the base and in contact withI said member and normally concealing thc binding screw but permitting access to said screw when the sleeve is removed, and means to maintain the sleeve in position.

In an attachment plug.l the eombination with a body portion carryingr an end contact, of an outer contact comprising a threaded sleeve surrounding said body portion and rotatably mounted thereon, a coilducting member carried by said body portion having a sliding engagement with said sleeve and carrying a binding post, a socket carried by sai conducting member. an iiisulating bushing secured in said socket. and means adapted, when said bushing is secured in position, to take the strain of the conducting wires from the binding posts.

6. An attachment plug comprising a base having an end contact and a suitably associated binding lpost. and having a sliding contact member and a binding post associated therewith an'l accessible from the side, al removable rotate. le threaded sleeve in electrical connection with said contact'. member, and a bushing or body portion for holding said shell in position, whereby said binding post is accessible by retrieving said sleeve.

7. In an attachment plug, the combination with a bodv portion, of a center-contact thereon having one of the contact wires attached thereto, an outer contact comprising a threaded sleeve. surrouiuling said base and rotatably -inounted thereon. a conducting member carried by said body ortion having suitable contact with sai sleeve and carrying a binding post. a socket carried by said conducting member, an insulating bushing fitting said 'socket and adapted to maintain Isaid sleeve in position, and an insulat; ing member on saidvsleeve by which the same may be rotated.

8. An attachment plug comprising a base provided with an exposed end contact, a

contact. sleeve about the base and i'einovable thcrel'roin independently of the end contact, and a sleeve-retainiug member co-axial with the sleeve and scparahly connected to the base. 9. An attachmcnt'plug comprising a base having a contact, a rciiioi'able contact sleeve about the base, a conducting member on the 65 base to accoiiniiodate the conductor passing base associated with the sleeve, and a removable cap attached to said hase to innintain the sleeve on thc buse. .said cap heilig removable iiulepcndently of any conducting 5 parts.

10. In an attachment plug, a base of insulating material, a removable, rotatable threaded sleeve associated therewith, a side binding post concealed by and in electrical connection with said sleeve, and an end binding )ost having a binding screw. eoaxial witii the hase.

1l. An attachment plug having an end contact, an outer contact consisting of a 1l threaded sleeve, and an insulating," be d about the sleeve beyond the threaded portion thereof, and of substantially the saine diameter as the threaded portion of the sleeve.

12. An attachment plug comprising an insulating body portion, an exposed center contact at one end thereof, a conducting ring on the other e i thereof, a threaded sleeve in electrical contact with said ring and rotatable thereai'ound, an insulating bushing secured to said ring and formed to prevent the withdrawal of said body portion and ring fromsaid threaded sleeve.

13. An attachment plug comprising a base having a center contact ada ted to be 80 electrically connected with one o the leading in conductors, a removable side contact sleeve on the base, said sleeve being adapted to be electrically connected with' the other leading in conductor, and a sleeve-retaining 86 member separably connected to' the base,

said member also serving to grip the leading in conductors between itsel and the base.

14. An attachment plugcomprisiiig a base having bindin' posts, a rotatable contact 40 sleeve removablvmounted o n the base, and a bushing separately connected to the base to maintain the sleeve on the base and also clamp the conductors leadin to the binding-posts between itself and t ie base.

46 1li.4 Iiian attachment plug, the combination of a base having end and side contact conductor terminal bindingposts, said side contact consisting of a threaded sleeve, uml

a. sleeve-retaining conductor-gripping mem- 50 her connected to the base.

10. An attachment plu com rising a hase rovided with a wedge-s a e portion and aving conductor terminal inding-Rosts, a 'threaded rotatable contact sleeve on t e base,

,6 a sliding contact connection between one of the binding-posts and the contact sleeve, and a bushing connected to the base for gripping the conductors leading to the bimhng-posts between itself and the wedge-shaped portion.

17. An attachment plug comprising a base having an ex ioscd conductor-terininal hindlngpost at t e end thereof, and having a passage through said end between the axis of the binding-post and the periphery of the to the said binding-post. and a thread coiitactrsleeve on the base.

18. An attachment plug comprising base, a conducting lsleeve. telescoping t base and immediately inclosin f the saine, binding-post on the base for tiic sleeve. ce doctor normally concealed by the sleeve b exposed when the latter is removed, and i exposed end contact on the base consistii of a conductor-terminal binding-screw, t base having :i passage tlirou h its end l cated between the axis of the inding-scre und the peri 'bory of the base for the accor iuodatoii o the conductor leading to' tl said end binding-screw.

lll. ln an attachment plug, the combin` tion with an insulating base having au e: posed end contact, of an outer contact coi lsis-ting of a threaded sleeve rotatable i1 dcpendently of the hase and separable then froniindependently of the saidend contac 20. ln an attachment, plug, the combini tion with an insulating base having an e1 posed end contact, of an outer contact col sisting of a threaded sleeve rotatable abot the base and removable therefrom indepenr' ently of the end contact, and bindin poll on the base for the conducting corig am eiated with the contacts.

.21. An attachment lug comprising a one piece insulating base. iavin an'exposed en` contact, a conducting mem er on the bw and au outer threaded contact rotatabl about the base and electrically connected t the said member, said one piece base carry ing th line-terminal bindingposts for .botl contac s.

22; An attachment lug comprising a one piece insulatin base aving an exposed ent contact carrie thereby, a conducting mem ber on the base, and an outer contact. elec trieally connected to the said conducting member and consisting of a threaded sleevt externally dis osed with respect to the basi and removab e independently-of the encI con act.

Q A'n attachment plug comprising an insulating hase having an Aexposed end contact, a conducting member on the base,'an outer contact. electrically connected to the member and consistin of a threaded sleeve rotatable about and te escoping the base and removable therefrom" independently of the end contact, and line terminals on the base associated with the conducting member and the end contact.

24. In a'n attiichiuentplug, an insulatin base, a self-su posting. threaded rotatabe sleeve of metal) removably associated with said base und haring a hund-hold attached thereto at thu outer end, a binding post at the side o l the said hase concealed by and in electrical connection with said sleeve, and a binding post at the end of said hase a8- soriated with an end contact on said base.

25. An attachment plug comprising a ro tatalile threaded .sleeve havingr a hand-hold, and two body portions one having a handhold and the other carrying all ot' the electrical conducting parts except the said sleeve.

26. An attachment plug comprising an insulating base havin an end contact, an outer contact rotataile about the hase, a conducting sleeve on the base in circuit with the outer contact and provided with a threaded extension, an insulating bustling engaging the threaded extension to provide means to hold the base when the outer con tact is rotated, und means on the base for connecting the end 'contact and sleeve in circuit.

27. In an attachmentI plug, a one-piece insulating base carrying all the electrical conductin )arts except the outer contact, a threadc s eeve constituting the outer con tact in rotatable connection withelectrical conducting parts on said base, and suitable means for holding said sleeve in operative position.

28. An attachment plu comprising two body portionsonc sultab y ormed for the sassage theret rough of the leading in con uctors andl the ot 1er carrying an end terriinal and a contact member and n pair of lbinding posts respectively in contact therewith, and. a threaded sleeve maintained rotatahly in electrical connection with said contact member by means of said body portions. l

29. The combination with an insulatin block and a sleeve surrounding the bloc and having a thread extending above the block, of an insulatin cap having a. circular groove, one wall of w lich is threaded to engage the thread of the said sleeve.

30. An attachment plug comprising a base earryin an end contact and a sliding contact mem cr and a pair of binding osts respectively. in electrical connection t erewith a rotatable threaded sleeve in elec trical connection with said contact member, and suitable means for maintaining said b ase and threaded sleeve in operative re1at1on.

In witness whereof, I have hereunto subscribed my name in the. presence cf two witnesses.

REUBEN B. BENJAMIN.

Witnesses:

A. H. Bonmcnna, C. L. Ilorxms.

lit) 

